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i965/fs: Fix message register allocation in FB writes.

Browse source 
Commit 6750226e6d bumped the base MRF to
m2 instead of m0, but failed to adjust inst->mlen, which was being set
to the highest MRF.  Subtracting the base MRF solves the issue.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
This commit is contained in:
Kenneth Graunke 2011-06-29 16:47:30 -07:00
parent f747d03b1d
commit eafc74d7d4
1 changed files with 6 additions and 5 deletions
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11
src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
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@ -1791,7 +1791,8 @@ fs_visitor::emit_fb_writes()
{
this->current_annotation = "FB write header";
GLboolean header_present = GL_TRUE;
int nr = 2;
int base_mrf = 2;
int nr = base_mrf;
int reg_width = c->dispatch_width / 8;
if (intel->gen >= 6 &&
@ -1870,8 +1871,8 @@ fs_visitor::emit_fb_writes()
fs_inst *inst = emit(FS_OPCODE_FB_WRITE);
inst->target = target;
inst->base_mrf = 2;
inst->mlen = nr;
inst->base_mrf = base_mrf;
inst->mlen = nr - base_mrf;
if (target == c->key.nr_color_regions - 1)
inst->eot = true;
inst->header_present = header_present;
@ -1888,8 +1889,8 @@ fs_visitor::emit_fb_writes()
}
fs_inst *inst = emit(FS_OPCODE_FB_WRITE);
inst->base_mrf = 2;
inst->mlen = nr;
inst->base_mrf = base_mrf;
inst->mlen = nr - base_mrf;
inst->eot = true;
inst->header_present = header_present;
}